Transmog is amazing, but I cannot bring myself to praise Blizzard for it. It was enormously overdue, and a simple uninspired copy paste feature other games shipped with YEARS ago, not to mention the stupid restrictions and god damn enchants ruining the vast majority of weapon skins.

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Sturgeon's Law states that 90% of everything is crap. When posting try and be in the 10% once in a while. It makes it better for everyone.

TBC- PvP balance was the best it's ever been. It wasn't perfect by any means, but fights in arenas were decided on who had the quickest and most decisive actions/counteractions, and healers were no where near as prominent.

WotLK- The story was great. This was the first expansion where it felt they really worked out a flowing, cohesive story.

BC- Nagrand (best safari zone on the planet)
WoTLK- Lich King (one of the most atmospheric fights in WoW so far)
Cata- Transmog, transmog, transmog and LFR
MOP- Gotta see how it plays out honestly. But I was disappointed with the questing after Jade Forest.

WOTLK: Story and the epicness of Northrend
Cata: Redoing old world and Deathwing attacking random zones
MoP:....Everything so far

I cried alone every single night. It felt like every day that passed here stole another piece of my real life away. After i cried, I’d go and fight as hard as I could. My only thought was winning, moving forward, and getting stronger. — Asuna Yuuki

World of Warcraft: The continued story of Warcraft.
The Burning Crusade: Two different instance modes, normal and heroics
Wrath of the Lich King: The mechanics in Ulduar before nerfs.
Cataclysm: Revamped world, still miss the old zones.
Mists of Pandaria: Not sure yet.